Waymarking

Description:
This site, which bills itself as "a scavenger hunt for unique and interesting locations in the world," allows users to add photographs and descriptions of locations as designated by a waymark, "a physical location on the planet marked by coordinates (latitude/longitude) and [which] contains unique information defined within its waymark category." Site is browsable by categories or waymarks (and often by postal code).??Categories include castle, firehouse, and art museum.